Dishwasher

A method of operating a dishwasher, the dishwasher comprising a washing chamber arranged for holding soiled items to be washed, a filter comprising a filter surface, a circulation pump connected to a sump of the dishwasher downstream of the filter, a soil trap disposed separate from a circulation flow, wherein an inlet of the soil trap is defined adjacent an edge of the filter surface, a soil removing unit comprising a filter cleaning unit and a transport unit, wherein the filter cleaning unit comprises a plurality of outlets disposed beneath the filter and downstream of the filter, wherein the transport unit comprises a plurality of nozzles arranged adjacent the filter surface, and wherein the plurality of nozzles are oriented parallel to the filter surface towards the inlet of the soil trap, the method comprising:

• filling the sump with a washing liquid to a washing liquid level, wherein the washing liquid level extends at least to a portion of the filter;
• circulating washing liquid into the washing chamber with the circulation pump to generate the circulation flow wherein the washing chamber is configured such that, when the circulation flow of washing liquid passes through the washing chamber, soil is released from the items to be washed and caught in the circulation flow, and wherein the filter is such arranged that, when the circulation flow of washing liquid with soil passes through the filter, soil is separated from the circulation flow of washing liquid and caught at the filter;
• releasing bubbles into the washing liquid with the filter cleaning unit, such that the bubbles move in the washing liquid through the filter in a direction opposite a direction of the circulation flow to release the soil from the filter
• maintaining the washing liquid level at least while the bubbles are released into the washing liquid during a washing cycle;
• and
• transporting soil released by the filter cleaning unit adjacent the filter surface and into the soil trap with the transport unit.